[Bldg-sim] Easy Question

[Rodney Boerman]

Is maximum 40%WWR intended to apply to gross building or to principal
exposures?  Assume 4 exposures: 1: 30% wall (100% window), 2: 20% wall (0%
window), 3: 30% wall (0% window), 4: 20% wall (0% window).  Building WWR =
30%.  Would baseline window WWR match exposure 1 of design case at 100%WWR?
Prior to 2004 addendum #1, (equalized banding) would have modeled all
baseline walls at 30%, but now will match proportions of design case, even
if an exposure exceeds 40% - (and proportionally reduce all exposures only
if building WWR exceeds 40%)?


On Tue, Apr 13, 2010 at 3:16 PM, Dana Troy <DTroy at glumac.com> wrote:

>  All,
>
>
>
> As per Addendum A to 90.1-2004, you do NOT need to distribute the baseline
> glazing uniformly in horizontal bands across the four orientations. ASHRAE
> 90.1-2007 is basically 90.1-2004 incorporating the changes made in Addendum
> A. All addenda can be found here:
> http://www.ashrae.org/technology/page/132
>
>
>
> If you read Table G3.1.5, it only states that the glass must not exceed 40%
> and must be distributed by the same proportions as the proposed building.
> Therefore, if you have a building with 50% WWR, you just have to reduce *each
> window by 20%*. This will still ensure that you have the same proportions
> (e.g. 20% of all of the glass on the north, 30% of all of the glass on the
> south, 40% of all of the glass on the east, and 10% of all of the glass on
> the west).
>
>
>
> If your baseline WWR is less than 40%, then leave the window proportions,
> shapes, and sizes the same in the baseline and the proposed design.
>
>
>
> This has all been well documented on the archives as well:
> http://lists.onebuilding.org/htdig.cgi/bldg-sim-onebuilding.org/2007-April/004077.html
>
> * *
>
> Regards,
>
>
> *Dana Troy*
> Energy Analyst
> LEED® Accredited Professional
>
> [image: http://www.glumac.com/glumacsig.gif] <http://www.glumac.com/>
>   ------------------------------
>
> 320 SW Washington, Suite 200
> Portland, OR 97204-2640
> T.  503.227.5280  F. 503.274.7674
>
> *Thinking. Inside the building.*
> www.glumac.com
> [image: http://www.glumac.com/consider.gif]
>
>
>
> *From:* Carol Gardner [mailto:cmg750 at gmail.com]
> *Sent:* Tuesday, April 13, 2010 11:58 AM
> *To:* Rimes, Christie
> *Cc:* bldg-sim at lists.onebuilding.org
>
> *Subject:* Re: [Bldg-sim] Easy Question
>
>
>
> Perhaps I'm missing something, but didn't he ask us how to *calculate *the
> window to wall ratio? If I'm not missing something, we need to know
> specifically, is the wall number wall only or wall + glass. This level of
> information is shown on the LV-D report in eQUEST, if he's using eQUEST.
> That's why I said, "it depends".
>
> Carol
>
> On Tue, Apr 13, 2010 at 11:45 AM, Rimes, Christie <
> Christie.Rimes at wspfk.com> wrote:
>
> For the 90.1-2004 I have always taken it as Luke explained, evenly
> distributed the WWR of the entire building.
>
> However for 90.1-2007 I have interpreted the description to mean that the
> windows stay in the same location as the proposed building?
>
>
>
>
>
> *Error! Filename not specified.*
>
>
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Vikram Sami
> *Sent:* Tuesday, April 13, 2010 11:38 AM
> *To:* JohannesHopf; bldg-sim at lists.onebuilding.org; LukeWilson
>
>
> *Subject:* Re: [Bldg-sim] Easy Question
>
>
>
> Interesting point. I've never noticed this before, but this is different
> from 2004.
>
>
>
> 2004 stated :
>
>
>
> *Vertical fenestration areas for new buildings and additions shall equal
> that in the proposed design or 40% of gross abovegrade wall area, whichever
> is smaller, and shall be distributed uniformly in horizontal bands across
> the four orientations.*
>
>
>
> It looks like they have changed it (shall be distributed on each face of
> the building in the same proportions in the proposed design) to be more
> representative of the actualy building. I think 2007 is asking you to
> distibute it by orientation (if you have 40% on the west, 25% south,
> 20%north and 25% east in your design, you will have 40% on the west, 25%
> south, 20%north and 25% east in your baseline). This makes sense because
> otherwise we were doing the striping as well as the 4 rotations which was a
> little redndant.
>
>
>
> (Not so easy question after all, but a good one).
>
>
>
>
> --- On *Tue, 4/13/10, Wilson, Luke <LWilson at integral-group.net>* wrote:
>
>
> From: Wilson, Luke <LWilson at integral-group.net>
> Subject: Re: [Bldg-sim] Easy Question
> To: "Hopf, Johannes" <johannes.hopf at dreso.com>, "
> bldg-sim at lists.onebuilding.org" <bldg-sim at lists.onebuilding.org>
> Date: Tuesday, April 13, 2010, 10:05 AM
>
> ASHRAE 90.1-2007 Table G3.1 reads:
> "Vertical fenestration areas for new buildings and additions shall equal
> that in the proposed design or 40% of gross above-grade wall area, whichever
> is smaller, and shall be distributed on each face of the building in the
> same proportions in the proposed design."
>
> I wasn't aware that this requirement had changed in the 2007 version
> (thanks Cam!).
>
> Luke
>
> -----Original Message-----
> From: bldg-sim-bounces at lists.onebuilding.org<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim-bounces@lists.onebuilding.org>[mailto:
> bldg-sim-bounces at lists.onebuilding.org<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim-bounces@lists.onebuilding.org>]
> On Behalf Of Hopf, Johannes
> Sent: Tuesday, April 13, 2010 12:55 PM
> To: bldg-sim at lists.onebuilding.org<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim@lists.onebuilding.org>
> Subject: Re: [Bldg-sim] Easy Question
>
> I can't find this section in Table 1.3.? I just find the 40% limitation for
> the baseline building. Can you post an excerpt?
>
>
> Best regards
>
>
> Johannes
>
> -----Ursprüngliche Nachricht-----
> Von: bldg-sim-bounces at lists.onebuilding.org<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim-bounces@lists.onebuilding.org>
> [mailto:bldg-sim-bounces at lists.onebuilding.org<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim-bounces@lists.onebuilding.org>]
> Im Auftrag von Wilson, Luke
> Gesendet: Dienstag, 13. April 2010 17:18
> An: Eurek, John S NWO; bldg-sim at lists.onebuilding.org<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim@lists.onebuilding.org>
> Betreff: Re: [Bldg-sim] Easy Question
>
> John,
>
> I'm assuming you are using ASHRAE 90.1-2007 Appendix G for your Baseline?
> If so, the way I read it from Table G3.1 is that you should evenly
> distribute
> the WWR of the entire building, not for each floor. Therefore I would use
> 11.4% for each floor.
>
> Luke
>
> -----Original Message-----
> From: bldg-sim-bounces at lists.onebuilding.org<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim-bounces@lists.onebuilding.org>
> [mailto:bldg-sim-bounces at lists.onebuilding.org<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim-bounces@lists.onebuilding.org>]
> On Behalf Of Eurek, John S
> NWO
> Sent: Tuesday, April 13, 2010 10:22 AM
> To: bldg-sim at lists.onebuilding.org<http://us.mc656.mail.yahoo.com/mc/compose?to=bldg-sim@lists.onebuilding.org>
> Subject: [Bldg-sim] Easy Question
>
> I have a two story building.  For the baseline I am evenly distributing the
> fenestration.
>
> The first floor window area is 462.2 ft^2
> The second floor window area is 647.1 ft^2
>
> The first floor wall area is 4858 ft^2
> The second floor wall area is 4858 ft^2
>
> In the base line model do I use:
>
> First floor 9.5%
> Second floor 13.3%
>
> OR
>
> First floor 11.4%
> Second floor 11.4%
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